Conditional field bug with singular checkbox

I've been having a play with the conditional fields (Beta2) and these seem to be working fine with the exception of the very first combo I tried, a singular checkbox that triggers the form to display additional items. If I changed this to multivalue checkboxes or radios, then it worked as expected.

Set up
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Name, textfield required
Field2, textfield, not required
Additional info, select/multiple [yes|Supply additional information]

Page break

Additional field, conditionally show if Additional info == yes
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I got this working for this combination by removing the "Always save at least something, even if it's an empty single value." lines in the select submit and defaulting $show_component to FALSE when the input values are empty and the test values are not.

Since I spent a hour tracking this down, I took the 5min to checkout the dev version to create a patch. Since I can not see why the other lines were there in the select submit callback, this patch will probably break something else???